Grinding-wheel adapter



Jan. 13, 1931. l f A. D. ROBINSON. 1,738,634

' -GRINDING WHEEL ADAPTER Filed J\i1 1e4,-1928.

INVENTOR.

BY y

A TTORNEYS.

rete ted Jets-13,; 11931 ARCHIE D. noninson, or wasm'emmmssicstsms r enrnnme-wnnnn hnnrrn 'fi i i {Application filed June 4,

. This invention relates to an adapter, which isintended to be placed in the bore of awheel, such asfa" grinding wheel for example, for the purpose of centralizing therein an arbor,-having a diameter smaller than that of said bore.

The manufacturer of grinding wheels is I facedwith'the'problem thata wheel, of any given size, may befused on" arbors ofwidely varying'diameters. To avoid making each size of wheel with a plurality of different 1 bores to fit all possible conditions which may arise, he standardizes the bore andfurnishes the user with a device to adapt this standard I 'la bore t0 the customers arbor.

i to f centralize the arborjin the-bore of the wheel, while the holding flanges on the arbor are being clamped against the side faces of the'wheeh. Q

The objectoftheinventionis to provide an adapter for the'purpose describedfwhich may be made up from thin 'sheet metalfby Jmethods adapted for quantity production manufacture at low unit cost,and which will I p j In certain cases, as for example where-the effectively centralize]'thefarbor in the bore of the wheel while the latter is being 3 clamped between the holding'flanges. v The.invention also has for an object to provide an adapter for thepurpose described, .one 'onl'y'of which is'required foreach ftirely. within the bore of the grinding wheel and will serve'its purposeequallywell' regardless of the width of the" wheel,-being effective for the'narrowfest as weugas the widest andall intermediate widths of wheels over the usual range. e i

. The invention also has for an object the provisionof an adapter for the purposeset V forth, which is'so constructed that the one adapter will serve to centralize arbors of various diameters within a given range; thereby making it unnecessary to provide I p an adapter for every size ofarborto be used. .7 50. These and other objects will appear in,

wheel. The one adapter maybe located en- The ring, whenreleased, expands and presses 192s. warm. tam

the following 'd aii tm andwill be t biae ed out, in the appended claim.

" The inventionfwill: be disclosed ri is ing an adapter, embodying my applied to. 'agrinding wheel; 1

'Fig. 2 is -afr agmentary cross sectional view taken on the line 2- -2 of Fig.'1'-;' J

1 Fig. 3 is a developedjview ofthe blank from which oneof the adapters is made;

=Fig. 4c'is an end view'of one'of'the adapters; and I; Figs; 5, 6, 'andfare sectional elevationali views showing the three'xsizes of adapters 5 needed to cover the entire range of arbors which maybe used w th one grindlng wheel.

- Refer'rin'gtothese drawings,--the adapter iis preferablyfimade up' from flatthi'n'. sheet metal. Blanks, such as that shown in Fig.v 3, may be-stamped from'such metal, forming v a strip 10' from, one edgeof'which a plurality of fingers 11 extend. "These fingers are bent *backwardly relatively-to theostripzl0,*aitterv which the stripis rolled up into substantially I lwith refi 'erence to the {accompanying -drawings,' in

a'sectional elevational view show-' invention, 7

circularformwith its ends-adjacent but not I meeting, asishown in Fig. 4." .7

diameter ofthe arbor closely approaches that up as'before described,toformaxsplit ring but the fingers 11 areformed. by striking: in'partsiof thebody-ofthe stripu i Ineach case, however, the adapter consists a of a split ring-preferably of thin quadrangulargcross section, with'aseries of fingers,

thereonat angularly spaced intervals; 5 Each such finger is integrally connected atone end to the ring and extends. inside the-ring and longitudinally,thereofif Q The ymaterial feed" is; preferablyl spring metal, which may be hardened and tempered I after the adapter has been formedThe split 'ringL-part is constructed so that-when compressed until its 'endsmeet, it will readily iitfinto the bore 12 of a grinding wheel-'13.

against the wall of bore 12 to frictionally hold the adapter in place. The fingers are preferably arranged so that they may be 7 flexed within reasonable limits, whereby an adapter of one size will readily accommodate arbors of several different diameters.

As an illustrative .evample, the :bore 12 of wheel 13 may be one inch and, with that bore, I may use-any of the three adapters shown in Figs. 5, 6 and/. That shown in Fig. 5 will accommodatearbors having diameters from one-quarter of an inch to threeeighths of an inch, both inclusive. That shown in Fig. 6 will accommodate arbors having diameters from seven sixteenths of an inch to five-eighthsof an inch, both inelusive. That shown in Fig. 7 will accommodate arbors from eleven-sixteenths of an inch to seven-eighths of an inch. The above figures are purely illustrative and not intended in .any sense as limits.

. It will be noted that in Figs. 5, 6 and 7,

the intermediate one of the three fingers '11 the center of circle 17 .and the two left hand fingers appear considerably out of center.

When ring'10 is contracted so that its outside diameter equals the inside diameter of bore 12, the inner ends of the several fingers are equidistant from the center of the ring, which is then of true circular form." In use, an adapter, of the proper size for the arbor to be used, is placedinthe bore 12 of wheel 18, as above described, after which the arbor 14 is pushed into place. The spring fingers 11, even with the smallest size of arbor in the range for which they are intended to be used, will be flexed, radially outwards to some extent when the arbor is inserted and these fingers, being originally uniformly bent, will locate the shaft centrally of bore 12 and willalso frictionally hold it in place while the wheel 13 is being clamped between the usual flanges 15' the narrowest wheel used and it will then serve'for wheels of all other widths.

Since the wheel 13 .isclamped between the flanges 15, it is unnecessary that the adapter do'more than centralize theshaft. It does not have to be constructed to resist displacement of the shaft after the flanges have been applied. Consequently, it can be made of thin metal, permitting economy in manufacture. Also, one adapter is all that is required for each wheelj Moreover, as above described,;the manufacturer needs to stock only the three sizes of adapters to satisfy the needs of all of his trade.

It will be obvious that the adapter will serve equally well for polishing, bufiing and other sorts of wheels. The reference to grinding wheels is intended as an illustrative example of one of many possible uses for the invention and not in any sense'as.

hat I claim is:

.. The combination with a grinding wheel and an arbor on which it is to be mounted, said Wheel having a bore extending axially therethrough and larger in diameter than the arbor, of a single member located entirely within said bore and frictionally held to the wall thereof, a series of spring fingers on said member angularly spaced thereabout and directlyengaging'said arbor for center ing it inthe bore preliminary to clamping the wheel to the arbor, flanges for engaging I opposite end faces of said wheel, and means clamping said wheel between: said for flanges. 1

In testimony whereof I have affixed my signature.

' ARCHIE D. ROBINSON.

by turning upnut 16. The fingers, it is true,

centralize the shaft merely at one point in its length but this is all that is required. The flanges. 15, when drawn up against opposite faces of wheel 13," serve to square up the shaft and force its axis into parallelism with that of bore 12. I Therefore, it is simply necessary to center the shaft atone point only.

Because of this fact, a single adapter is all that is necessary for each wheel, whether that wheel be wide or narrow. Therefore, I can make the adapter of a width to. s it 

